Exposure guard for cameras



May 30, 1933. L BENDER EXPOSURE GUARD FOR CAMERAS Filed June 8, 1931 WITNESSES ATTORN EYS Patented May 30,l 1933 UNTED STATESk PATENTl OFFICE LOUIS BENDER,ZOF,RIDGEWOOD, NEW-YORK EXPOSURE GUARD-FORy CAI/IIEZR-ASy Application filed .Tune 8, 1931. Serial No. 512,954.,

This invention relates to cameras, and has i. Figure 3 is dan enlarged fragmentary secparticular reference to a device for reducing tional view illustrating the position of the to a minimum and practically precluding the parts of the mechanism during the actuationpossibility oit eii'ccting a double exposure on of the shutter actuating means.

5 the saine lilm area and preventing the failure igure 4; is a similar view illustrating the to eillect an exposure upon one or more-'of position of parts after-the completion of the th@ 51m r9/M manipulation of the shutter actuating means The invention broadly aims to provide a and showing the manner in which said means mechanism interposed between and cooperisr locked againsta subsequent actuation.Y v

ating respectivelyv with the shutter actuating Figure is a similar view illustrating the. 60

means and the means for presenting oi' frammovement or the key to manipulating posiing the film areas for exposure, which mechtion for turning the iilm roll to present or anism after eacli manipulation of the shutter frame a-new areal of the film for exposure. actuating means, locks said means against Figure 6 is a view illustrating the movea subsequent manipulation until the means nient of' the key of the lilm area presenting 65.`

for presenting or framing the next film area or frainingnieans to an inactive position for for exposure has been operated. releasing and holding the mechanism re- Th-e invention also comprehends ya meehleased to permit of the exposure of a new aiiism of the character set forth, which fur.- `1lII1 aiea.

thi. functions, after presentation of L new Figure I7 is an enlarged fragmentary sec- 70 ilin area for exiiosui'e, to prevent a subse- @Olla-l Vlew taken approximately on the line quent manipulation of the ilm presenting H7 OfFigure l. or framing means until the shutter actuating Referring to the drawing by characters of means has been operated to expose the frame, reference, A designates the shutter actuating V whereby to obvia@ the possibility of failure arm of the' camera2 which'upon downward 75" to effect the exposure. movement in the direction indicated by the @ther objects of the invention reside in the .LII'OW 111 Figure l is designed to effect the production. of a mechanism of the indicatedr @PelllgOf til@ ShUGl' and 'the exposure of hammer which employs but few and simple the framed iiim area in the usual manner. B

pal-t5 Capable of .economical production, asdesignates the usual film spool upon which 8o Semblagg and jnCOrpOl-aton in a Camera ,tlielilin'strip is wound by means of a spindle structure. and which mechanism eiiciently C; 1t 196mg undefStOOd that 'the Spindle and accomplishes the intended purposes. Spool -have thensual foi-moi interengageable With the above recited and other objects COU-PllngDWhlh 1S cDgagcd-byinward movein view7 reference is had to the following dement' 0f the SplIlClle and disengaged by out- 85 scriptioii and accompanying drawing7 in Ward movement thereof. The spindle in the T'Vhch hQy@ is exhibited a Single and pre- PFGSQH lILJt-L'DCQ lltSrSCllT/fi tlll'QlO for turneri'ed embodiment of the invention, while` lng and Shlftmf movemlf tlelGOf iLlL head the claims define the actual scope of the .10 having late'l-U/ PTOJGCDQ tlunnons l1 40 Sam@ upon which'the terminals l2 oi a manipu- 90 Imm@ drawing: n lating key 13 are liouriialed for swinging Fgup@ l a fpagmQn-taly front View 0f al II'lOVGl-iltllt' fl'OlD all lllvll'dly @Xtel'ldlng 3C- camera equipped with an exposure guard lglV@ lOSltlOn'Q il Ugh@ llgulally dSPOSQd mechanism constructed in accordance with lDdCtlVC POSltlOU- The tl'mnalS 12 are th@ invention, piu-15S being broken away and shaped to icoriiiv cams having angularly dis- 95 shown in section to disclose the underlying posed faces l-i and l5 which are respectively structure. l spaced dilierent relative distances from the Figure 2 is an enlarged fragmentaryv seculcrum point provided by the trunnions 11,

tional view taken approximately on the line `and which cam faces accomplish a purpose'. r

indicated at 2 2 in Figui'eln which will hereinafter be developed. The 100 2L C lisposed between the 1 l wall of the 1 i 1 "1 and carrier =l1e ,fide Camera bod;r t

end of 1s engageable within groove when the the influngageable pulled out- 1 ence of t therefroi wardly. surrounds the thimble 1 fi-h eluteh teeth 2G on .fignel to be engaged from stationary The 111er periphth which the engage for the thimble 17 clutch and spindle C. i -ie eluteh sleeve is further is engagwl. The shifting et intermediate its ends as at l o3 of oaf spring 34 whieh is anehoref at its opposit end P5 to an inner f 1e means for imparting 1 shiftinT v l lever 531 is .seen

.movement to the shutter actuating element or arm A includes a vertically m`V vable slide 3? which is mounted on the inner housing plate for guided movement through the medium of a pin 3o and slot L. The slide is Connected by a flexible shaft. -1 to the actuator arm A. said shaft extending through a flexible tubing 11. A tlezible nanipulater shaft 4:2 is also connected with t e slide and extends through a' flexible tubi i with the expose-fl erd oi the sha t formed with manipulator button #ifi- Ob\.fiousl'v, when the buL ton lis pressed inwardly. the .slide 37 moved upwardly and in so moving exerts a pull on the flexible aft t0 to depress the shutter aetuati rm it being understood that the springl (not shown) whieh forms a part of the shutter meehanism and which returns the shutter' arm t to its upper normal position also funetio '1 to return the slide to its lower normal position.

In order to provide means for l ,i slide aga' ist movement. to prevent attuation of the shutter, a locking lever alla is provided which is fulerunied as at ilo between the inner housing plate '16 and an outer ho11 The upper bifureated end l in 0' the plot-n .e *uw 0i the locking lever receives between the fureatlons thereof7 the lower t f the extremity oshifting lever 31 and the lower terminal 41S of the locking lever is designed when moved inwardly to the position illustrated in Figures d and 5 of the drawing, to be disposed in the path of movement of the shoulder 49 formed on the slide. rFhe inherent spring action of the leaf spring 34. acting through the shi 'ever 31 and the bifureated upper extremity 47 of the locking lever tends to effeet the inward movement of the lower ex tremity 48 of the locking lever to its obstructing position. A detent dog 50 is provided whieh is fulrrumed as at 51t and said dog is normally urged by a spring 52 to engage with a laterally projecting pin 53 on 1e locking lever o hold the lower end 4-8 of 1e same out of the path of movement of the ioulder 49 so as to permit of actuation of he shutter and upward movement of the lide The free end of the dog is disposed 1u the path of movement of the upper end 5t ofthe slide when said slide approaches the uppermost limit of its movement whereby the dog may be tripped to release the same from engagement with the pin 53.

In use and operation, assuming the parts to be in the posit-ion illustrated in Figure 1 and an unexposed film area properly presented or framed for exposure, the user depressesy the button l, thereby effecting upward movement of the slide, exerting a downward movement of the shutter actuator arm r1 through the medium of the flexible shaft 40. As the slide moves upwardly, its upper end 5l trips the dog 50, thereby releasing said dog from the pin and permitting the spring 34 to function through the lower portion of the shift lever 31 to swing the lower end 4S of the locking lever la inwardly against the lower portion of the slide 37. As the slide moves downnardly7 due to the pull exerted by the return movement of the actuator arm A, the lower extremity 48 of the locking lever 44a snaps over to a position in the path of subsequent upward movement of the shoulder 49 ofthe slide, thereby locking the slide, the manipulating shaft il@ and shaft et() to prevent a subsequent actuation of the shutte arm A. In order to move the locking lever .so that its lower terminal 1S will be retracted from the obstructed position illustrated in Figures and it is neeessary for the user of tln` camera to ti swing the key 13 from its depending ver-tI Vaosition to its horizontal position as illustrated in Figure 5, and thence downwardly to return it to its vertier-l position. Obviously, if the user swings the hey to the horizontal position. it unlikely that he will fail to turn the ihn spool to present or :frame a new film area for exposure. lhen the key 13 is swung upwardly after an exposure has been made, the cam face 15 being Closer to the axes 11, permits the leaf ,soring El to more the Clutch sleeve outwardly, whereby the teeth Q6 are disengaged from the teeth 27,

il t) thus freeing the key, clutch sleeve, thimble and spindle for turning movement to rotate the film spool B. After the film spool has been turned to position or frame a new film area for exposure, the key 13 is again swung downwardly, as illustrated in Figure 6. The downward swinging movement of the key cams the clutch sleeve 25 inwardly, thereby re-engaging the clutch teeth 26 with the clutch teeth 27 and at the same time exerting an inward movement through the shift lever 3l against the action of the leaf spring 34 of the upper end of the locking lever 44a, swinging the lower extremity 48 of the locking lever outwardly out of the path of movenient of the shoulder 49 and permitting the detent dog 50 to drop or to be returned by its spring 52 to a detaining position with reference to the pin If for any reason the operator should attempt to again turn the spindle without having made an exposure, by moving the key to a horizontal position, it will be found that the clutch teeth 26 engaging with the clutch teeth 27 will prevent such a turning movement, thereby defeating the possibility of moving the film area before it has been exposed. This is due to the fact that the locking dog maintains the locking lever 44a in such position that the shift lever 3l is held against a complete outward movement, and this complete outward movement can only be effected after the locking dog has again been released by upward movement of the slide to effect an actuation of the caniera arm. It is, of course, obvious that after the shutter has been. actuated to effect the exposure and the slide has been moved upwardly to release the dog, the locking lever will permit the full outward movement of the clutch lever 25, so that the film spool may be turned by the key 13 when swung to its horizontal position.

From theforegoing, it will thus be seen that a simple and effective device has been devised for the purpose of preventing double exposure and avoiding the failure to expose the film area.

What is claimed is:

l. In a device of the character set forth as and for the purpose specified, the combination with a manipulating key movable from an inactive to an active position for successively presenting .film areas for exposure and means operable by the key when in its inactive position for preventing presentation of a succeeding film area, of means for locking the shutter against successive actuations and a connection between said latter means and the former means for releasing the shutter locking means after the manipulating key has been moved from its inactive position to its active position and returned to its inactive position.

2. In a device of the character set forth as and for the purpose specified, the combination with a manipulating key movable from an inactiveto an active position. for succesa f sively presenting film areas forexposureand means voperable by the key when in its inactive position for preventingpresentation of a succeeding` film area,of means for locking the shutteragainst successive actuations and a connection betweensaid latter means Hf f and theform-er means for releasing the shutter locking means after the manipulatingkey has been moved from its inactive posi-y l tion toits active position and returned to y its inactivegposition, said connection also functioning to prevent presentation of a sucf ceedingl film area until after the shutter lock-- ing means has been released.

3. An exposure guard for cameras havingv the combination of a key movable from an inactive position to an active position for presenting the; film areas for exposure, a clutch actuable by the key when inactive for rendering the film presenting meanswinoperative, a slidemoivable by and with the camera shutter actuator, `a normally restrained detent-D f ,eo

releasable by operation of the shutter actuator to prevent subsequent actuation of the shutter-.and a connection betweenthe clutch y and detent operable to restore .the detent-toi its restrained position whenv the key has been moved toits active position and rreturned to its inactive position.

4;. An exposurek guard for cameras yhaving the combination-.of a key movable fromV an*S l inactive position to an active positionfor presentingthe film areas for exposure, a clutch-actuable by the key when inactive for rendering the film presenting means inopera tive, aslideinovable by and with the camera shutter actuator, a normally restrained detent releasable by operationof the shutten actuatorfto prevent subsequent actuation ofL the shutter and a connection .between the clutch and detent operable torestore the detent to itsl restrained position when the key has beenmoved to its active position and re,-

Lier,

ilo

turned to its inactive position,v said,connec- Y tion also functioning to prevent complete vre-.y l lease .of .the clutch untilafterthe detent has been released by the actuation of.y the shutter.

5. In acamera having a shutteractuator and a .film area presenting means, the com-I bination .of a device for preventing a doubley exposure including a yslide movable by and with 4`the shutterA actuator, a locking lever movable to: a position to obstruct the move=vl CTI the lrey when in its inactive position, a common spring pressed member for urging said clutch to a released position and for swinging said locking lever to a position to obstruct the movement oi the slide.

G. rllhe combination with a camera of mechanism interposed between and cooperating respectively with the shutter actuating means and the ilm area framing means and operable upon each manipulation of the shutter actuating means to lock the same against subsequent actuation until the film area framing means has been manipulated, said mechanism including a slide movable by and with the shutter actuator, a locking lever movable to a position to obstruct movement of the slide and prevent actuation of the shutter, a pawl engagea le with the locking lever for holding the same inactive, said pawl being disposed in the path oi movement of the slide for release thereby, a pivoted key for the film framing means, said key being swingable 'from an inactive position to an active position, a shiftable clutch operable in one position to lock the lm framing means against movement and movable to said position by the hey when in its inactive position, a common spring pressed member for urging said clutch to a released position and for swinging said locking member to aposition to obstruct the movement of the slide.

7. The combination with a camera of mechanism interposed between and cooperating respectiveiy with the shutter actuating means and the ilm area framing means and operable upon each manipulation of the shutter actuating means to locl; the same against subsequent actuation until the iilm area iframing means has been manipulated, said mechanism including a slide movable by and with the shutter actuator, a locking lever movable to a position to obstruct movement of the slide and prevent actuation of the shutter, a pavvl engageable with the locking lever for holding the same inactive, said pawl being disposed in the path or' movement of the slide for release thereby, a pivoted key for the film framing means, said key being swingable from an inactive position to an active position, a shiftable clutch operable in one position to locl; the film framing means against movement and movable to said position by the key when in its inactive position, a conimon spring pressed member for urging said clutch to a released position and ior swinging said locking member to a position to obstruct the movement of the slide, said member also functioning to prevent complete release of the clutch when the locking lever is held inactive by the pawl whereby to prevent a successive actuation of the film framing means until an exposure has been made.

LOUIS BENDER. 

